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  1. Laser28

    Diamond Grinding

    Check out: http://www.igga.net/
  2. Laser28

    swelling spalling concrete in bridge with stalactites.

    I would also like to know where the bridge is - this sounds more like alkali-aggregate reactivity.
  3. Laser28

    Retexturing Concrete Pavement

    Check out: http://www.igga.net/
  4. Laser28

    DGA as SubGrade Material

    Are you using a true vapor barrier or is this just 6 mil poly? Poly reduces vapor transmission about the extent a well-cured 3000 psi concrete mix will. In a situation such as this, where there will be floor coverings, materials stored in contact with the floor, a proper asphalt impregnated...
  5. Laser28

    Asphalt overlay of cracked pavement

    Cold-in-place will cure all your cracking problems. Foamed asphalt is even better, as it cures more rapidly and allows the immediate placement of the asphalt overlay. the pulverizing of the old asphalt and a portion of the aggregate base will remove all of the cracking, and reduce the...
  6. Laser28

    Rolling Resistance for Earthmoving Vehicles

    UPDATE: Thanks for asking about the study. The original study was conducted (I believe) for the World Bank) about 25 years ago, and one of the researchers (Zaniewski) repeated the work for FHWA. That was published as well by PCA. A more recent study was completed by the National Research Coun...
  7. Laser28

    Wheel Load on Slab-on-Grade

    For the design of concrete slabs-on-grade with and without reinforcement, for any and all types of loadings, for expansive and "normal" soils - refer to Designing Floor Slabs on Grade: Step-By-Step Procedures, Sample Solutions, and Commentary by Ringo and Anderson from Aberdeen Press and Amazon.
  8. Laser28

    Concrete adhesion testing

    Yes, there is a bond test or pull-off test for concrete coatings.; Check with ASTM - I can't remember the number, it was 25 years ago when I built my first CANDU reactor and we were testing epoxy liners. You coat the concrete sample, score the coating and concrete with a 2" diamond drill bit...
  9. Laser28

    Sensitivity of Compaction

    As most of my experience is in roads, I have to say that the use of in-situ testing is a great tool for compliance testing, but a poor tool for performance testing. I always try to get my clients to insist on proofrolling roads and parking lots, and after each layer if possible. I tend to roll...
  10. Laser28

    Rolling Resistance for Earthmoving Vehicles

    I don't know of a specific study involving rolling resistance vs soil types, but there was a World Bank study that examined rolling res. for trucks on asphalt, concrete and gravel surfaces. It showed that there was adistinct savings in energy consumption as the surface became more rigid. The...
  11. Laser28

    Strength Invesitgation of Extensively Heated Concrete

    The temperatures that you describe will generally have an effect only in the early ages of the concrete, and only while there is still moisture present in the concrete. The temperature will cause the concrete temperature to rise to the boiling point of the water in the concrete and eventually...
  12. Laser28

    MORTAR CUBES compressive strength, asap please

    Hey Ron - if you read my post you will see: "And of course, the addition of slag, fly ash and or silica fume will all have an effect on the rate of strength gain." Slagging my post will not get you points! My comment regarding rate of strength gain is based on "cement" not...
  13. Laser28

    Alternatives to pre-cast deck

    I was involved in an economic study about 10 years ago regarding various types of construction for parking garages. Even with only one local precaster (no competition), the most cost-effective system, taking into consideration ease of construction, quality, low maintenance (in a freeze-thaw...
  14. Laser28

    MORTAR CUBES compressive strength, asap please

    I would be very cautious of applying the 65% estimation factor these days. I don't know where your get your cement, but the powders today are ground so finely that it is more likely that you are getting as much as 95% of the 28 day strength at 7 days. Many of these estimations are based on...
  15. Laser28

    Coefficient of subgrade reaction

    http://hotmix.ce.washington.edu/wsdot_web/Modules/04_design_parameters/04-2_body.htm#k
  16. Laser28

    Asphalt Millings Structural Coefficient for Pavement Design

    Sorry! Yes, I meant a structural coefficient of 0.11 using the AASHTO design methodology. I would be interested in hearing what others use as coefficients for other recycled materials (rubblized concrete, for example) and for expanded asphalt. As the modulus of expanded asphalt increases over...
  17. Laser28

    Asphalt Millings Structural Coefficient for Pavement Design

    I have used millings as a base for asphalt concrete pavement in Northern Ontario, for roads carrying logging trucks. When aggregate sources are few and far between, you tend to make use of every resource. We used a conservative structural coefficient for the millings of 11. After...
  18. Laser28

    Low Concrete Strength

    Almost 7 months after the fact, I have to contribute this: CSA statese very clearly that the reason for casting and testing concrete cylinders is to determine the quality of the concrete AS-DELIVERED. The cylinders are NOT indicative of the concrete in-situ because of the differences in...
  19. Laser28

    Estimation of bearing capacity of soil type

    Check out http://www.usace.army.mil/inet/usace-docs/eng-manuals/cecw.htm and download the pdf file for EM 1110-1-1905. Table 4-8 is what I was looking for, and confirms/agrees with other sources. This table is for spread footings, rather than floor slabs, and the article provides guidance for...
  20. Laser28

    Fly Ash & Entrained Air

    Why does fly ash "eat" air entrainment? Specifications for supplementary cementing materials such as fly ash limit the carbon content of the ash, because it is the carbon content that reduces the effectiveness of the air entraining admixture. Fly ash is produced in coal burning power...

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